Vintage 1970 Seiko 6139-7010 SpeedTimer "Military" JDM Serviced Original

Offered for sale is an original March 1970 Seiko 6139-7010 “Military” Speed-Timer, powered by Seiko’s pioneering Calibre 6139 automatic chronograph movement. This reference was supplied to the Japanese Defence Forces, including the Japan Maritime Self-Defence Force (JMSDF) and Japan Air Self-Defence Force (JASDF), making it one of the most collectible early Seiko chronographs.
 
This example presents in excellent original condition, retaining its original dial along with beautifully aged original lume to both the hands and hour markers. The watch has been fully serviced by TEMPO PRIMA and all functions operate correctly.
 
Key Features
 
Model: Seiko 6139-7010 “Military” Speed-Timer
Year of Manufacture: March 1970
Movement: Seiko Calibre 6139 automatic chronograph, fully serviced and running accurately (see timegrapher photos)
Case: Original finish with only light wear consistent with careful vintage use
Bracelet: Original Seiko bracelet, approximately 19.4 cm in length (see sixth photo)
Service: Fully serviced with new seals fitted and crystal.
Condition: Excellent original vintage condition with an attractive, honest patina
 
Additional Information
 
The Seiko 6139-7010 “Military” Speed-Timer is among the most desirable variants of the 6139 chronograph family, particularly when found in such original condition. This watch has been sympathetically serviced while preserving its originality, making it equally suitable for both collectors and regular wear.
 
Please examine the photographs carefully, as they form part of the description and accurately represent the watch’s condition and originality.
 
A Note on Vintage Watch Ownership
 
Vintage mechanical watches are robust and reliable, but they are not as accurate as modern quartz watches and require periodic servicing. Some signs of age and natural patina should be expected and are considered part of the character of an original vintage timepiece.
 
At TEMPO PRIMA, we believe original watches should be preserved rather than restored. We do not pressure-test vintage watches and therefore cannot guarantee water resistance, regardless of their original specifications. For their long-term preservation, we recommend keeping all vintage watches away from water and excessive moisture.